Unpredictable bug.
D000941:Antigens; D004196:Disease Outbreaks / Q000517:prevention & control; D004636:Emergency Service, Hospital; D006276:Health Facility Size; D006723:Hong Kong; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*; D009975:Orthomyxoviridae / Q000276:immunology; D006113:United Kingdom
D000941:Antigens; D007252:Influenza Vaccines